arch/mn10300/kernel/csrc-mn10300.c

   1 /* MN10300 clocksource
   2  *
   3  * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
   4  * Written by Mark Salter (msalter@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  */
  11 #include <linux/clocksource.h>
  12 #include <linux/init.h>
  13 #include <asm/timex.h>
  14 #include "internal.h"
  15
  16 static u64 mn10300_read(struct clocksource *cs)
  17 {
  18         return read_timestamp_counter();
  19 }
  20
  21 static struct clocksource clocksource_mn10300 = {
  22         .name   = "TSC",
  23         .rating = 200,
  24         .read   = mn10300_read,
  25         .mask   = CLOCKSOURCE_MASK(32),
  26         .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
  27 };
  28
  29 int __init init_clocksource(void)
  30 {
  31         startup_timestamp_counter();
  32         clocksource_register_hz(&clocksource_mn10300, MN10300_TSCCLK);
  33         return 0;
  34 }